The No.536 has several operational and standby modes - the measurements below represent typical values measured at 120VAC: Mode Typical Power Consumption Notes On 210 Watts With no input or output loading Normal (standby) 4.1 Watts/100 Watts Unpon initial power-up/After first use Power Save (Standby) 4.1 Watts Green (Standby) 0.3 Watts OFF 0 Watts Via rear panel switch Note that the No. 536 cannot be shut off by the front button – this is used only for switching the amp in/out of a standby mode. Also note that when set to the Normal standby mode, the amplifier will initially consume the same power as when in the Powersave mode but will change to a higher level after it is switched on for the first time.